Water-motor.



H. R. IRWIN.

WATER MOTOR. APPLICATION FILED SEPT. 7,1908%.

1,082,634, I Patented Dec.30,1913.

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. \Mwvxon Meg-8W6 5 12M HARRY R. IRWIN, 0F NEWPORT, KENTUCKY.

WATER-MOTOR.

Specification of Letters Patent.

Patented Dec. 30, 1913.

Application filed September 7', 1909. Serial No. 516,367.

T0 (ZZZ whom it may concern Be it known that I, HARRY R. IRWIN, acitizen of the United States, residing in Newport, in the county ofCampbell and State of Kentucky, have invented certain new and usefulImprovements in VVater- Motors, of which the following is a full, clear,and exact description, reference being had to the accompanying drawings,forming part of this specification.

My improvements relate to water motors for driving light machinery andthe like,

in which a hollow piston is provided divided I into an inlet and exhaustchamber, and provided with inlet and exhaust valves, which valves arethrown at the end of the stroke of the piston to shift the water supplyfrom one side of the piston to the other.

I have illustrated my invention with special reference to thereciprocating type of a Water motor, although the invention is equallyapplicable to the rotary type of motor, and, when applied to the rotarytype, to constructions in which the hollow valve chamber is mounted onthe oscillating pis ton, or in which the valve chamber is fixed and theoscillating piston is solid.

The object of the invention is to avoid the use of springs for the inletand exhaust valves, and to make use of the water pressure which isaccumulated behind the inlet valve to force it to its opposite seat.

The invention consists of that certain novel construction of inlet andexhaust valves and arrangement of parts to be hereinafter particularlypointed out and claimed.

In the drawings Figure 1 is a cross section taken through the motorcylinder of my improved motor. Fig. 2 is a central longitudinal sectiontaken on the lines 2, 2 of Fig. 1. Fig. 3 is a perspective view of thedouble puppet inlet valve. Fig. 4 is a perspective view of the doublepuppet exhaust valve.

8 is the motor cylinder, provided with the heads 4, 5, properly securedon the ends of the cylinder.

6 is the piston which is constructed with a central hollow space dividedinto two noncommunicating chambers 7 8, by the partition wall 9.

10 is the piston rod passing through the head a with suitable stuflingbox 11, and provided on its outer end with any suitable means orconnecting mechanism for c0mmunicating power.

12 is the supply pipe for the water, and 13 the exhaust pipe, whichpipes are secured to the head 5, and provided with suitable stuffingboxes 14, 14.

15 is the tube for conveying the supply water to the inlet chamber 7 ofthe piston, and 16 is the tube for taking off the exhaust water. Thesetubes are suitably secured to the piston 6, and as the piston is movedthe tubes slide back and forth in the stuffing boxes 14.

17 is the double puppet inlet valve which has its seats on either sidein the hollow plugs or sleeves 18, 19, secured respectively Iion thewalls of the piston in the inlet cham- 20, 21 are the valve stems of theinlet valve, and these stems are hollow tubes open at the outerends,-loosely fitting in the plugs 18, 19, and provided with openings22, 23, at the base of the hollow tubes near the valve seats. The waterin passing from'the piston inlet chamber into either end of the cylinderpasses through these openings 22, 23, and through the hollow stem intothe cylinder, while the hollow stems project beyond the outer face ofthe piston.

24 is the double puppet exhaust valve, provided with valve seats 25, 26on the outside walls of the piston on each side. This exhaust valve isalso provided with the pins 27 28 projecting behind the head of thevalve into the cylinder on each side, and each valve is also providedwith a solid cylindrical portion 29, 30 of the same diameter as thewings 31, which connect the two valves. The length of the hollow stem 20on the inlet valve and the projecting pin 27 of the ex haust valve, andthe corresponding lengths of the projecting hollow stem 21 of the inletvalve, and pin 28 of the exhaust valve are such that the pins 27, 28project from the face of the piston slightly farther than the stems ofthe inlet valve, when the valves are on their proper seats for themovement of the piston in either direct-ion.

The operation of the motor is as follows: As illustrated in Fig. 2, thesupply of water is entering through the tube 15, into the inlet chamber7 and passing into the left hand end of the cylinder through theopenings 22, and the hollow stem 20 of the inlet valve, and the pistonis moving in the direction of the arrow from left to right. The inletvalve being seated on the plug 19, and the exhaust valve being on itsseat 25 with the exhaust water from the right hand end of the cylinderpassing into the chamber 8, and out through the exhaust tube 16. As thepin 28 of the exhaust valve projects slightly beyond the hollow stem 21,when the piston reaches the right hand end of the cylinder, the exhaustvalve stem will contact with the head 5 of the cylinder, and slightlyunseat the exhaust valve. The exhaust valve, however, is provided withthe cylindrical portion 30, which is not projected from the valveopening, so that there is only momentarily a very slight leakage as theexhaust valve is unseated. This is suiiicient, however, to overcome theinertia of the exhaust valve, and to relieve the pressure somewhat fromthe left hand end of the cylinder chamber. There is still a sufiicientpressure to carry the piston slightly farther to the right which bringsthe hollow stem 21 to a seat on the cylinder head 5, and unseats thevalve 17 sufficiently to allow the water in the piston chamber 7 toenter the openings 23 in the stem, and fill up the hollow stem 21. Thisinrush of the water under full pressure into the hollow stem 21, takenwith the slight release in the left hand end of the cylinder by theunseating of the exhaust valve, en ables sufficient pressure toaccumulate in the hollow stem 21 to force the inlet valve into itsopposite seat, closing the left hand end of the cylinder and openin endunder full pressure, ant? the exhaust valve is fully actuated and forcedto its seat 26.

In the same way as the piston moves on its return stroke, the exhaustvalve is first momentarily unseated, then the hollow stem 20 of theinlet valve is closed by coming in contact with the cylinder head 4, andbeing.

unseated, the inrush of water into the closed stem projects the valve toits opposite seat,.

and the motor continues its operation as long as the water pressure issupplied.

By providing for the exhaust valve stem slightly longer than the inletvalve stem, and arranging for the shoulder at the valve" seat so thatthe exhaust valve when unseated will only open to the extent of theloosenessi of fit in the valve opening, I find that very. satisfactoryresults are obtained and considerable latitude is allowed in the lengthof the pins on the exhaust valve. So long as;

the right hand by this pressure the exhaust valve is started from itsseat prior to the contact of the hollow inlet valve stem with thecylinder head, with very appreciable wear of the parts the valve willstill operate perfectly, and it is not necessary to provide for anygreat accuracy.

Having thus described my invention what I claim' as new and desire tosecure by Letters Patent, is:

1. In a water motor, a motor chamber with a movable piston therein,means for supplying water to both sides of said piston, and means forexhausting the water therefrom, an inlet valve and a double. puppetexhaust valve to control the exhaust, with extensions within the valveseat to check the exhaust upon the unseating of the exhaust valve.

2. In a water motor, a motor chamber with a movable piston therein,means for supplying water to both sides of said piston and for exhausingthe water therefrom, with double puppet, inlet and exhaust valvestherefor, said inlet valve having hollow stems projecting into the motorchamber on each side of the piston, with openings beyond the valve seatsinto said stems for the passage of the water, and to accumulate pressureto fully actuate said valve and the exhaust valve provided with stemsprojecting into the motor chamber on each side of said piston, slightlybeyond the projection of the hollow stems of the inlet valve and meansfor checking the exhaust upon the initial unseating of the exhaustvalve.

3. In a water motor, a motor chamber with a hollow piston therein,having an inlet and an exhaust chamber with double puppet, inlet andexhaust valves therefor, the inlet valve provided with hollow stemsprojecting into the motor chamber on either side, and having openingsbeyond the valve seats into said stems, said exhaust valve projectinginto said motor chamber on either side slightly beyond the projection ofthe inlet valve stems, with extensions within the exhaust valve seats tocheck the exhaust upon the unseating of the exhaust valve.

HARRY R. IRIVIN. lVitnesses:

ARTHUR H. EWALD, EARL M. GRIFFIN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C.

